CAL 737-300 round dials don't have GPS installed. Still has FMC, but they update by VOR/DME.
ASA's 50 seat RJs primary FMC position also comes from VOR/DME, and the GPS is used as backup. Never could figure that one out.
I was talking to a Comair guy when I was on the ATR, and he asked if I liked flying it. I said yeah, but it would be nice if it had and FMS, or GPS. He said "you guys don't have GPS?" I said no. He thought about that for a minute, and then asked "how do you navigate?"
All signals go into computer to "vote" on position and FMS determines position based on weighted average. If you want, I guess you could turn off IRs and hard tune VORs. It would take me a minute to figure out how to hard tune and display ADF. No Radio Disney for me...
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